lil devil

Hey people, here is the situation on my 94 civic dx stock engine with 300k. problem I am having is 1.) while the car is maintaining speed at around 1/4 throttle it would just chokes like there is no gas and then runs fine and it would happen again within 3-5 mintues and so on. 2.) while the car is picking up from a stop at a steady speed at 1/4 throttle, the car would chokes(like no gas is going to the engine) and runs fine after. 3.) Sometimes the car would just stall while the car is parked. BTW the car is a manual and the problems just started 2 weeks ago. Thanks all